IAHR Document Library

« Back to Library Homepage « Journal of Hydraulic Research 2012 Issue 1

Pier scour in clear water for sediment mixtures

Author(s): Junke Guo

Linked Author(s):

Keywords: Bridge scour; CSU equation; Hager number; pier scour; sediment mixture

Abstract: The current pier scour design in the USA is mainly based on the CSU equation, yet a recent incisive evaluation indicates a need to change it because substantial advances were made in the last two decades for understanding the pier scour processes. The objective of this research is then to propose a simplified scour mechanism and a physically-based scour depth equation for practical design purposes. A critical review on selected previous studies is first made to form the basis of this research. A simplified scour mechanism is next proposed in terms of the pressure gradient through flow–structure, flow–sediment and sediment–structure interactions. A hypothesis on the equilibrium scour depth equation is then proposed based on the understanding of the scour mechanism and tested by flume data. Finally, the proposed scour depth equation provides a criterion and a rule of thumb for scour design and evaluation.


Year: 2012

Copyright © 2024 International Association for Hydro-Environment Engineering and Research. All rights reserved. | Terms and Conditions